Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire, it being understood that the tread pattern repeats uniformly throughout the circumference of the tire;

FIG. 2 is a perspective view there;

FIG. 3 is a left side view thereof, the right side view being identical thereof; and,

FIG. 4 is an enlarged fragmentary view showing details of the tread portion thereof.

In FIGS. 1-4, the broken lines defining the sidewall, and inner depict environmental subject matter that forms no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 